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What Size Envelope Fits an A5 Card?

When sending invitations, greeting cards, or specialty stationery, a common question arises: What size envelope fits an A5 card? 

The answer is simple: An A5 card (148mm x 210mm) fits perfectly into a C5 envelope (162mm x 229mm) or a slightly smaller 152mm x 216mm envelope. The C5 size provides just enough room for the card to slide in effortlessly, offering a snug, polished fit without being too tight. 

However, choosing the right envelope isn’t always straightforward. Depending on the occasion, you may want to consider other options—such as oversized envelopes for decorative inserts, square designs for a contemporary touch, or padded envelopes for added protection. Let’s explore these choices step by step.

Whether you’re planning a large event, running a business, or simply sending a greeting card, understanding envelope sizes will help ensure your content is delivered in style. 

A5 Card Dimensions: The Basics

An A5 card measures 148.5mm x 210mm, exactly half the size of an A4 sheet when folded or cut. It’s a versatile choice commonly used for:

  • Greeting cards 
  • Wedding invitations 
  • Event stationery 
  • Flyers or announcements 

An A5 card strikes the perfect balance—it’s large enough to make an impression while remaining compact and practical for posting.

This guide focuses on three popular sizes in the C series—DL, C5, and C6—to help you decide which is most suitable for your needs. 

Exploring Alternative Envelope Options

While the C5 is the most common choice for A5 cards, it’s not your only option. Depending on your design and needs, you might want to consider these alternatives:

1. Oversized Envelopes

If your A5 card includes embellishments such as ribbons, wax seals, or thicker layers, you may need a more spacious envelope. Some great options include:

  • 6” x 9” envelopes for extra room.
  • B5 envelopes (176mm x 250mm), slightly larger than C5, ideal for bulkier designs.

These options provide breathing room while keeping your card safe and presentable.

2. The 152mm x 216mm Range

Another excellent choice for A5 cards is the 152mm x 216mm envelope. Slightly smaller than a C5 but still roomy enough, this size offers a closer, neater fit for A5 cards without too much excess space.

This makes it particularly popular for:

  • Wedding invitations, where presentation is key.
  • Premium stationery, where a snug fit enhances the overall look.
  • Cards with moderate embellishments, as the envelope balances security with elegance.

The 152mm x 216mm range can also feel more refined compared to larger oversized options, making it a great in-between choice if you’re after something a little more tailored than the standard C5.

3. Padded or Protective Envelopes

If your A5 card includes delicate elements like pressed flowers, intricate beadwork, or handmade accents, a padded envelope offers extra protection during transit. Metallic padded envelopes can add a chic, protective touch, ensuring your creation arrives intact and in style.

Quick Envelope Size Chart

Here’s a simple guide to help you pair popular card sizes with their matching envelopes:

Card Size

Measurement

Matching Envelope

Envelope Measurement

A6 Card

105mm x 148mm

C6 Envelope

114mm x 162mm

A5 Card

148mm x 210mm

C5 Envelope

162mm x 229mm

A5 Card (snug fit)

148mm x 210mm

152mm x 216mm Envelope

152mm x 216mm

A4 Card

210mm x 297mm

C4 Envelope

229mm x 324mm

DL Card

99mm x 210mm

DL Envelope

110mm x 220mm

Square Card (150mm)

150mm x 150mm

155mm Square Env.

155mm x 155mm

Square Card (210mm)

210mm x 210mm

220mm Square Env.

220mm x 220mm

This chart is handy for quickly checking envelope sizes when planning stationery or printing projects.

A Complete Guide to Choosing Envelopes for A5 Cards

Selecting the right envelope for your A5 cards isn’t just about finding the correct fit – it’s also about ensuring your cards are well-protected, cost-effective to post, and beautifully presented. Here’s what you need to know: 

  • Posting Regulations 

Postal services categorise envelopes based on size and weight, which impacts postage costs. A C5 envelope (162mm x 229mm) for an A5 card typically falls under the “large letter” category in most regions. Be sure to check your local postal guidelines to avoid surprises. 

  • Paper Weight & Thickness 

If your A5 card is made with thick card stock (300gsm or higher), you may need a slightly larger envelope to prevent damage to the card’s edges. Always account for any inserts or embellishments when choosing your envelope size. 

  • Style & Occasion 

The right envelope can elevate your card’s presentation and make a strong impression. Here are some suggestions based on the event: 

  • Weddings: Choose elegant finishes, like pearlescent or textured envelopes, to add a touch of luxury. 
  • Business: Keep it professional with classic white or cream C5 envelopes. 
  • Creative Events: Brightly coloured or square envelopes can create a bold, eye-catching aesthetic. 
  • Closure Types 

Envelope closure types matter, especially for convenience and security: 

  • Gummed: The traditional lick-and-stick option, offering a secure seal. 
  • Self-seal: Perfect for quick and efficient bulk posting. 
  • Peel-and-seal: Provides a strong, long-lasting adhesive, ideal for preparing and storing cards in advance. 

FAQs About A5 Cards and Envelopes 

Does an A5 card fit in a DL envelope? 

No. DL envelopes (110mm x 220mm) are made for DL cards or tri-folded A4 sheets. They’re too narrow for A5 cards. 

Can you post an A5 card in a C4 envelope? 

Yes, but a C4 envelope (for unfolded A4 paper) will appear oversized. A snug C5 envelope is a better fit for A5 cards. 

What’s the difference between A5 and C5? 

  • A5 refers to the card size: 148mm x 210mm. 
  • C5 refers to the envelope size designed to hold an A5 card: 162mm x 229mm. 

What envelope size is best for handmade A5 cards? 

If your handmade cards have embellishments, thick layers, or decorations, consider using a B5 envelope or a padded envelope for extra space and protection. The 152mm x 216mm size is also excellent for a closer fit with light decorations. 

Final Thoughts 

For most A5 cards, the best envelope size is a C5 envelope (162mm x 229mm). It provides a perfect, professional fit while leaving room for inserts or light decorations. 

However, if you prefer a slightly more tailored fit, the 152mm x 216mm range offers an elegant alternative, particularly for invitations and premium stationery. 

For unique or oversized designs, square or larger envelopes are a stylish choice, and if you’re posting delicate handmade cards, padded envelopes offer superior protection. 

The right envelope does more than just hold your card; it enhances the overall experience and presentation. By choosing carefully, you’ll ensure your invitation, greeting, or message arrives in perfect condition – making a lasting impression.

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